The native Safari browser on iOS 9 is too old to render the page.
Meta (WhatsApp’s parent company) typically provides a before cutting off an OS. As of 2024, WhatsApp still technically allows iOS 9 devices to connect, but features degrade quickly.
If you have previously downloaded WhatsApp on your Apple ID, you can go to the tab in the
Now, go to your iPhone 4S or iPad on iOS 9.3.6 and follow the steps in Method 1. Method 3: Jailbreaking and AppAdmin